whole house ventilation system with heat recovery

HR320 & HR400

Whole House Ventilation System

With Heat Recovery

Installation and Servicing Instructions

Please leave these instructions with the user

HR400

HR320

3

1.0 Introduction 4

2.0 Site Requirements 5

3.0 Installation 7

4.0 Electrical 17

5.0 Commissioning 18

6.0 Servicing 20

7.0 Fault Finding 21

8.0 Guarantee 22

Section Page

Contents

1.0 Introduction

4

1.1 Description

1. The HR320 and HR400 are arange of whole house ventilation units (Figs. 1 & 2).

The ventilation unit works in conjunction with aduct system enabling air to be transferredthroughout the house.

The whole house system works by replacingthe warm stale moist air from the house, withfresh air from outside. The fresh air passesthrough a highly efficient heat exchanger and isprewarmed by the heat which is recovered fromthe extracted air. The heat exchanger recoversup to 70% heat from the outgoing stale air.

1.2 Operation

1. The unit is designed to switch between trickleand boost settings to give optimumperformance. This can be achieved manuallythrough a switch or pull cord, or automaticallyusing a remote humidity sensor.

Trickle is continuous low speed at which the airin the property is changed approximately onceevery two hours.Boost increases the ventilation rate throughoutthe property for manual control. Underautomatic control the unit changes to boost onincrease in relative humidity above a set point.It reverts to trickle when the relative humiditydrops below the set point.

NOTE: The system is audible whenoperating at boost speed.

2. Speed control of the unit is via a separatetransformer (VCON77) which is capable ofgiving a range of six speeds (Fig. 3). Any twospeeds can be selected on installation to givetrickle and boost settings most appropriate tothe system.With the units operating on boost setting theelectrical power consumption is;

HR320 - 200WHR400 - 305W

NOTE: Refer to the VCON77 instructions forinformation on installation and speedselection.

Fig. 1

Fig. 2

Fig. 3

HR400

HR320

VCON77

2.1 Information

1. The fan unit is to be permanently connectedto the mains electrical supply and must beinstalled by a suitably qualified person.

2. The fan unit must be sited and connected inaccordance with UK Building and IEE WiringRegulations (BS 7671) or regulations and /orstandards appropriate to the country of use.

3. Wiring to the fan unit in the UK must be via a 3 Amp fused and switched connection unitincorporating a double pole switch having acontact separation not less than 3mm andconforming to BS 5733 or BS 1363 Part 4. Theconnection must be located outside of a fixedbath, shower or wash hand basin. The wiringshould be suitably (BASEC or HAR) approvedcable of appropriate current carrying capacity.

4. The fan unit is Class 1 and must therefore beearthed.

5. The fan unit must be connected to a trappeddrainage system to allow condensate to befreely drained from the unit to the chosendischarge point.

6. If the fan is installed in an unheated roofvoid, or similar location, it should be insulatedtogether with any associated ducting within thisspace.

7. The fan unit must be sited away from directsources of heat in excess of 40°C.

8. Do not position an internal extract valve/grillein the vicinity of excessive levels of airborne oilor grease i.e. above or close to a cooker.

9. If it is intended to fit an extract terminal/grillein a room containing a fuel burning appliance,the installer must ensure that provision for airreplacement is adequate for both appliancesand is in compliance with the requirements ofPart F of the current edition of the BuildingRegulations.

2.0 Site Requirements

5

2.0 Site Requirements

6

2.1 Information (cont)

10. The external grilles/terminals for the systemmust be sited at least 1m away from the flue ofa fuel burning appliance, in compliance with therequirements of Local Authority, BuildingRegulations and any other relevant Codes ofPractice.

11. All safety regulations and requirements mustbe strictly followed to prevent hazards to lifeand property both during and after installationor servicing.

12. Ensure that the mains electrical supply isswitched off before commencing installation,maintenance or servicing.

13. Fire compartmentation must be maintainedto comply with the requirements of the currentedition of the Building Regulations. Whereapplicable fire dampers complying with therecommendations of BS CP 5588: Part 9 willrequire to be installed in the ducting installation.

14. Do not locate fittings (QTET, QTB90,QTB45) closer than 2.5 diameters to each otheror to supply/extract terminal (SV100/EV100).

15. Never locate tees (QTET) directly over oradjacent to a terminal housing otherwise noisewill be generated.

3.0 Installation

7

3.1 Installing the Fan Unit

1. Check the diagrammatic ducting layoutdrawing to ensure that the proposed ductroutes, fan unit and air terminal locations canbe accomodated. If in doubt refer to theTechnical Department.

2. The units are suitable for either vertical orhorizontal mounting. After noting the positionsof the electrical connector, duct spigots anddrainage connection on the unit, choose asuitable installation site for the unit. The mostdesirable location for the unit, in single and twostorey properties with a roof space, is in theroof space.

3. Never locate the unit over a sleeping area -above the landing or bathroom is alwayspreferred. The selected site must allowadequate space around the unit for the removalof the access panel and heat exchanger formaintenance and servicing puposes.

Condensate Drainage HR4004. The condensate drain is supplied fitted to theunit as shown (Fig. 4).

HR3205. The unit is supplied with a 22mm diametercondensate drain fitting, packed loose in thebox. The WH unit casing is moulded with two22mm diameter drainage spigots in the bottomcorners. The casing of the unit can be set up forright hand or left hand drainage by cropping thedomed end off either one of these spigots andpushing on the condensate drain fitting (Fig. 5).

6. The units must be positioned so that thecondensate outlet can be trapped and thecondensate conveyed properly with acontinuous gradient to discharge through thegable or to the eaves gutter in the selectedlocation. Parts ref. CP, CPC and CPE areincluded with the kit. Connect the drainagesystem using the parts provided, jointing thePVC pipework and fittings using PVC cement toform watertight joints.

NOTE: Trap should be charged/filled beforeoperating the system and should bechecked, especially in summer.

BEWARE: A blocked condensate outlet pipedue to insufficient pipe run (gradient) willquickly lead to water damage.

Condensate Drain

HR400

HR320

Condensate Drain

Fig. 4

Fig. 5

3.0 Installation

8

Top Cover

Fig. 7

Fig. 6

Heat Exchanger

Filter

DrainOutlet

CondensateTrap

Joists

InclinedPlatform

Acoustic Mat

CondensateDrain

Mounting Pad

3.1 Installing the Fan Unit (cont)

Horizontal Mounting (Fig. 7)7. Before installation of the fan unit, a woodenplatform must be provided to mount the unit on.

8. The platform should be constructed from50mm x 100mm timber bearers with a 19mmblock board deck.

9. The platform should incline the unit to ensurea fall to the drain outlet. An acoustic mat(ACMW/HOUSE) can be fitted on top of theboard to minimise vibration.

10. Remove the top cover and withdraw theheat exchanger from the casing. Carefully drillfour holes through the mounting pads.

11. Secure the casing to the platform deckusing four No.8 round head screws and largepattern washers to dissipate the load (Fig. 6).

3.0 Installation

9

3.1 Installing the Fan Unit (cont)

Vertical Mounting HR400 (Fig. 8)12. The HR400 can be mountedvertically by securing with plugs and screwsthrough the casing (see horizontal mounting).

Vertical Mounting HR320The HR320 is supplied with a wall mounting kit.

13. Hold the unit against the wall and mark thehorizontal base line.

14. Remove the unit and position the mountingchannel on the line.

15. Mark through the three holes and drill andplug them (Fig. 11).

16. Secure the mounting channel to the wallusing the screws provided (Fig. 11).

17. Locate the unit’s lower mounting rib in thechannel and mark the position of the upperslotted mounting lug. Drill and plug the wall(Fig. 9).

18. Secure the unit to the wall ensuring a largepattern washer is used on the fixing lug (Fig. 9).

HR400

HR320

Fig. 8

Fig. 9

Fig. 10

Fig. 11

Mounting Channel

Securing Screwand Washer

Upper slottedMounting Lug

3.0 Installation

10

3.2 Installing the Ducting System

1. Cut off the closed ends of the duct spigotsthat are to be connected to the duct system.Ensure that no cutting debris falls into, orremains in the unit as this could damage thebalanced impellers and cause excessive noiseand vibration.

2. A shell bit is recommended for drilling holesin the ceiling to accomodate the housings forsupply and extract air terminals (SV100 andEV100). Make sure that you are not drilling intostructural members, water or gas pipes orelectrical cables and that there is room behindthe plaster board for duct access and securingring. Ceiling terminals should preferably befitted equidistant from adjacent walls bearing inmind that coving may already be fitted or maybe fitted at a later date.

3. Place the terminal housing in the hole in theceiling and secure to the back ring with the fourscrews provided.

4. For two storey new build properties it isrecommended that the ground floor terminalhousings are secured in position in advance ofthe plasterboard panels being fixed, byobtaining a sheet of plasterboard of the typeand thickness to be used. Cut a square of thesheet to just span two joists in the corner wherethe terminal is to be fitted. Remember that theedge of the sheet on the inner joist should onlyrest on half of the joist thickness. This allows afixing surface for the next sheet of plasterboardto be secured to when it is fitted. Tack up theplasterboard in position on the ceiling andconnect up and seal the duct and fittings (Fig 12).

5. For two storey existing properties it isnecessary to lift the floor coverings at first floorlevel above the terminal positions to gainaccess to the terminal housings to secure andseal the duct and fittings.

6. Fix in position all vertical supply and extractair ducting being conveyed between groundfloor ceiling level and the loft space (Fig 13).

Terminal Housing

Plaster Board

Securing Ring / Back Plate(for fire valves)

Securing Screw

Terminal

Supply and Extract Air Terminals SV100 / EV100

Typical InstallationQT3

Joist

RD040Floor Boards

Joist Direction

Terminal Housing

Plaster Board

EV100/SV100

RD015

Fig. 12

Fig. 13

3.0 Installation

11

3.2 Installing the Ducting System (cont)

7. The external grilles for intake and exhaust airshould be positioned so that the exhaust air isnot drawn in again.

8. If the grilles are fitted in the same gable at thesame height, a minimum of 1m between grilles isrecommended.

9. If the grilles are positioned above one anotherthe distance apart should be at least 1m with theexhaust grille at the top.

10. Roof ventilators placed on the same roofsurface should be positioned at the samedistances as the grilles.

11. Always ensure that all exhaust grilles/roofventilators are placed higher than the top edge ofthe highest window and at a distance of at least1m from the nearest window.

12. External grilles placed in the soffit should bepositioned at the same distances as indicated forgables.

13. The Quicktube Rigid UPVC duct systempermits fast, easy assembly whilst ensuringpressure-proof system sealing.

14. The ducts are delivered in lengths of 3m andare easily shortened as required with a duct sawor a similar fine toothed saw. We recommendthat you file the edges of the ducts aftershortening.

15. Assemble the duct and fittings, following asclosely as possible the diagrammatic ductinglayout. Ensure that the duct is raised above joistlevel to allow for thermal insulation of theducting.

16. Each straight length of duct is assembledusing a flexible connector (QTC) to join the twoends, whilst 90° and 45° diversions andbranches are accomplished with flexible fittings(QTB90, QTB45 and QTET). The duct is a pushfit into the socket of the connector and fittings.

17. Once assembled the joints are secured withduct tape (DT30) to provide an airtight seal.Ensure that the tape is secured over thecomplete joint area to provide an airtight seal.

3.0 Installation

12


18. The quantity and location of flexible silencers(FS100), if required, will depend upon totalairflow rate. If in doubt check with the TechnicalDepartment. These should be installed betweenthe unit and the first supply/extract terminal onthe duct system, to reduce the noise from theunit, which would otherwise be transmittedthrough the duct system and into the home.

19. If the loft space is unheated the unit andducting will require to be thermally insulated topreclude condensation occuring and to minimiseheat loss. This requirement must be observed inthe planning and routing of the duct system.

20. The insulation recommended comprises of3mm thick polyethylene bubble sheet laminatedon the external surface with aluminium foilprotected by a thin polythene film. The product isCFC and HFC free and has a surface spread offlame of Class 1 tested to BS476 Part 7/971. Itshould, however, be protected from open flamesor sparks and stored apart from highly flammablematerials.

21. The material provides resistance to heat lossfrom the distribution ducting and a highlyeffective vapour barrier when all joints are sealedwith metallised tape. It is light but robust, noteasily damaged in storage or during constructionand is rot proof, water and vapour resistent,durable and can be expected to remain aneffective insulant for the normal life span of abuilding.

22. The insulation is supplied in 1.5m longpreformed sections for application to the ductingat the time of installation. All joints should besecured using the metalised tape (DTA30)provided to ensure that a continuous vapour sealis maintained.

23. A purpose made insulating jacket is providedto enclose the heat recovery unit. Simply cut outthe material for ducting connections to ensure asnug fit.

24. The use of flexible ducting should be limitedto an absolute minimum. If used it should be fullystretched in order to minimse pressure loss.

3.0 Installation

13


25. A pack of pre-insulated flexible ducting(IFD100) is included with the kit together withworm drive clips (FC180). The flexible ducting isintended for use in making the final connectionbetween the rigid ducting and the externalwall/soffit grilles or roof ventilators.

26. Remove the controller (VCON77) from thepackaging, unscrew the cover retaining screwsand remove the cover.

27. Offer the base assembly to the selectedmounting surface and mark the fixing holepositions. Fix the base assembly to the mountingsurface using suitable woodscrews and ifrequired, wall plugs.

28. Install the manual control switch (NBSW andMBB), or pull cord switch (PCSW) in accordancewith the instructions supplied with it. Alternativelyinstall the automatic control option - a humidistat(HS6).

29. Before wiring the fan unit, controller andcontrol switch, ensure that the mains electricalsupply is switched off.

30. Cut to length, strip and connect suitablecables between the fan unit, controller andcontrol switch in accordance with the wiringarrangements.

31. When using surface wiring, which is notcontained in conduit, anchor the cables to themounting surface along their length andparticularly adjacent to the connection to the unit,controller and control switch.

32. Replace the controller cover and tighten theretaining screws while ensuring that no wiring istrapped between the base and the cover.

33. Locate the control switch on its mounting boxand tighten its retaining screws (NBSW orPCSW).

34. Switch on the mains electrical supply andtest for satisfactory operation of the fan unit andduct system. Operate the system with themanual control switch (NBSW or PCSW) set toboost speed, or with the humidistat (HS6) set atminimum and the cores of all the air valvesremoved. The system will be noisy, this is to beexpected. Operate the unit and system at boostspeed for approximately 15 minutes to ensurethat any dust and debris which has accumulatedduring installation is ejected.

3.0 Installation

14


35. The rectangular system of ducting, white rigidUPVC, permits fast, easy assembly and isnormally used in flatted accomodation. Thisducting can be surface mounted internally wherea ceiling void is not available, fitted betweenceiling and floor between joists, or when a ceilingvoid is not accessible or too small to work in.

36. The ducting (RD015), which has externaldimensions of 54mm x 110mm x 1.5m long, canbe mounted horizontally with the long sideagainst the ceiling or vertically with the long sideagainst a wall.

37. This is done by drilling a 25mm dia hole inthe underside or exposed vertical side of theducting and then drilling a pilot screw hole on thehidden side of the duct i.e. ceiling/wall side of theduct, through the 25mm dia hole. Correspondingfixing holes are drilled in the ceiling/wall and wallplugs fitted as required. Using a screwdriverthrough the 25mm hole fix the ducting with anappropriate size and length of screw through thepilot hole into the ceiling/wall. The 25mm dia holeis then sealed using an appropriate sized plug(PDPLUG) (Fig. 14).

38. A variety of push fit white rigid UPVC fittingsare available.

39. Duct runs longer than 1.5m can be built upby the use of straight connector pieces (RD020),changes in direction horizontally by 90° bends(RD050) and vertically by 90° bends (RD060),branches are obtained by the use of tee pieces(RD080).

40. Changes in section from the rectangular tocircular to accomodate the use of quicktube orflexible ducting (PFD100 etc.) can be obtainedwith bent adaptors i.e. 90° elbow joints (RD040),and straight adaptors (RD070). Note that theRD070 is an eccentric fitting which allows boththe rectangular and circular ducting to beinstalled flush to the wall/ceiling.

41. As the fittings are push fit over the outside ofthe straight duct (RD015 - 110mm x 54mm) asmall gap, 2mm wide, will occur at thewall/ceiling due to the thickness of the fitting.This can be filled by the use of a white siliconsealant.

Push Fit Grommet

Fig. 14

3.0 Installation

15


42. Rectangular ducting can be concealed in asuspended ceiling having a minimum clearanceof 76mm (double battening) between the ceilingand the plasterboard. This allows the use ofceiling mounted supply (SV100) and extract(EV100) valves utilising the 90° rectangular tocircular elbow joint (RD040). The spigot of theRD040 may have to be trimmed to facilitate this.

43. The system can be used with a variety ofwall louvres, grilles and terminals. The RD501 isan internal brick sized grille in white, 200mm x55mm, and can be used in conjunction with anadaptor (RD077) to convert to 110mm x 54mm.This permits connection to rectangular ducting.The RD501 grille can be used directly onto therectangular ducting either on the 54mm side orthe 110mm. This is done by cutting a hole,50mm x 100mm, in the duct, cutting off thesleeve at the rear of the RD501 to leave thegrille which can then be attached to the hole inthe duct by solvent or by a white silicon sealant.

44. Wall louvres such as the RD104 and theESG100 can also be used by converting tocircular with either a straight adaptor (RD070) ora bent adaptor (RD040). It is important toremember that the spigot on the RD104 isconcentric, which is difficult to use if therectangular ducting is hard against the ceiling orwall or both. In this use an ESG100 which hasan eccentric spigot.

45. Squareduct 100 is designed to provide asmooth bore ducting system which can besurface mounted in areas where concealment orboxing-in is difficult or undesirable. The ducting(SD3) comes in 3m lengths or (SD1.5) in 1.5mlengths and with clean butt joints and concealedfixing, Squareduct can be fitted along the top ofa wall providing a clean edge between wall andceiling.

46. All fittings are supplied with a matching pushfit grommet (PDPLUG) on one side. This isremovable to allow the fitting to be drilled andscrewed through the hidden duct wall to eitherceiling or wall. Removal of the grommet providesa 25mm diameter hole for access. Thisprocedure is very similar to that used forrectangular ducting. After fixing, the 25mm diahole is then sealed using the grommet(PDPLUG) (Fig. 15).

Push Fit Grommet

Fig. 15

3.0 Installation

16


47. A variety of push fit white rigid UPVC fittingsare available.

48. Integral grilles and louvres provide attractiveextract and supply for low cost installations. Tubeand fittings are manufactured in flame retardantplastics to DIN4102/B1.

49. A square to round adaptor (AD100) allows forsimple connection to the Quicktube (QT3)system and the use of all ancillary equipment.Wall louvres such as the RD104 and theESG100 can be used by converting to circularwith the straight adaptor (AD100). It is importantto remember that the spigot on the RD104 isconcentric which is difficult to use if theSquareduct is hard against the ceiling or wall orboth. In this case use an ESG100 which has aneccentric spigot.

4.0 Electrical

17

Mains Via 3A Fused Spur

Normal/Boost Switch

CN

B

L

N

L

N

O

B

ToHRVUnit

VCON77

C



Normal/Boost Switch

CN

B

L

N

L

N

O

B

ToHRVUnit

0

2

1

N

L

HS6

VCON77

C

VCON7 and NBSW / VCON100 Manual Normal to Boost Speed Control

Select appropriate VCON77 tapping for NORMAL speed setting

VCON7 and HS6 Automatic Normal to Boost Speed Switching

Select appropriate VCON77 tapping for NORMAL speed setting

4.1 Wiring Options

5.0 Commissioning

18

5.1 Commissioning the System

Before starting to commission the system checkthat the crossflow heat exchanger and the filterpanel (if ordered) are properly and securely inplace (Fig. 16). Check that all sockets arecorrectly engaged, that the wiring is secure andproperly mounted and that the unit cover issecured.

The scope of the commissioning procedurecomprises:

1. Balancing the two airflows to achievemaximum heat exchanger efficiency.

2. Adjusting the two airflows to obtain theoverall airflow rates and the individual terminalair flow rates as specified on the air changeschedule.

3. Adjusting the fan speed controller (VCON77)by increasing or decreasing the voltage settingto obtain the most economical running costsand the lowest noise levels attainable within theparameters of the design concept as specifiedon the air change schedule. The 230V tappingis for BOOST speed operation only. At thissetting, the system will be audible.

4. An airflow meter must be used to set thecorrect airflows.

5. Check that there are air gaps under allinternal doors to provide the transfer route of airfrom the “living” areas to the “wet” rooms. Closeall windows, outside doors and all fresh airterminals in windows and walls except thenecessary openings for gas oil heaters andstoves etc. Fit the cores of the air valves,ensuring that the correct type of supply andextract terminal device is used.

NOTE: The supply air terminal device isdirectional and incorporates a deflector plate.Ensure that the deflector plate is correctlypositioned so that the active part of theterminal device is discharging to the room.

6. Set the control switch (NBSW or PCSW)(Figs. 17 & 18) to normal speed or set thehumidistat (HS6) (Fig. 19) at maximum andcheck that air is flowing in the correct directionat each terminal point. At this stage it will savetime if all the terminals are fitted and opened toapproximately half way.

7. Commence with the extract system at theterminal nearest to the fan unit. Adjust andmeasure until the airflow for that particularterminal is achieved at the value indicated onthe air change schedule.

Fig. 16

Cover

Filter (optional)

Electrical Plug

Heat Exchanger

Fig. 17

NORMAL

BOOSTNBSW

NBSW

Fig. 18

PCSW

Fig. 19

HS6

5.0 Commissioning

19

5.1 Commissioning the System (cont)

8. Standard ceiling terminals type EV100 andSV100 are adjusted by turning the centralscrew and are locked in the “set” position by thelocknut.

9. Move to the next terminal down the line andadjust as before. Repeat until all extracts havebeen adjusted. Recheck the first terminal andadjust, followed by the second, third etc., untilall individual extract air flow rates are withinapproximately +/-10% of the design air flowrates.

10. If each terminal has to be almost closed toachieve the air flow rates, it is likely that theVCON77 “normal” voltage setting is too high.Change to the next lowest voltage setting andremeasure the individual air flow rates.

11. Conversely, if the airflows cannot beachieved with the terminals fully open it will benecessary to increse the VCON77 “normal”voltage setting by one step and to remeasurethe individual air flow rates.

12. When satisfied with all the extract air flowrates, repeat the procedure stated above for allsupply air terminals. In this case it is importantthat excessively high air velocities do not createdraughts and undue noise. It may be necessaryto install a volume control damper in the mainfresh air inlet ducting to increase systemresistance and hence induce the fan to movedown its curve (refer to the TechnicalDepartment should this circumstance prevail).

13. Louvered terminals type RD104 and RD501are adjusted by restricting the airflow usingacetate paper or similar, cut to the size requiredto achieve design air flow rates. If the internallouvered wall terminals (RD104 and RD501)are used for supply air then the terminalsshould be fitted at high level and the louvresshould direct the air upwards. Ensure that theflyscreen is removed from the RD104 louvredwall terminal and that the non-return flap isremoved from the RD501 wall terminal.

6.0 Servicing

20

6.1 Annual Servicing

1. As well as providing fresh pre-warmed air thesystem also removes odours, moisture,excessive heat and airborne impurities such asdust, dirt and grease. These impuritiesgradually build up and detract from theefficiency of the heat exchanger.

2. It is recommended that the system isserviced annually. Servicing must be carried outby a competent person.

3. Switch off the mains electrical supply to theunit.

4. Undo the captive retaining screws andremove the cover (Fig. 20).

5. Withdraw the heat exchanger (Fig. 21).

6. Wash the heat exchanger in warm waterusing a mild detergent and subsequently dry itthoroughly.

7. Remove filter, if fitted, and replace with newfilter media (Fig. 21).

8. Clean the interior of the unit with a vacuumcleaner if necessary and lightly brush the fanimpellors.

9. Disinfect the unit interior using a proprietaryproduct, noting and observing themanufacturer’s instructions.

10. Check the drainage system for integrity ofjoints and ensure that water flows freely andthat the trap is charged.

11. Replace the heat exchanger.

12. Replace the access panel and tighten thecaptive retaining screws.

13. Switch on the mains electrical supply andcheck for satisfactory operation.

Fig. 20

Cover

Fig. 21

Heat Exchanger

Filter (optional)

7.0 Fault Finding

21

Fault1. Unit will notoperate whenswitched on.

CauseElectrical Fault

RemedySwitch off the mainselectrical supply tothe unit and;a) check powersupply to switchedfused spur.orb) check fuseorc) check electricalconnector at unitord) check wiring toVCON77 controllerore) check wiring tocontrol switch(NBSW, PCSW orHS6)

Fault4. Low airflows atterminal devices

Cause1) VCON77controller set atincorrect voltage2) Flexible silencercrushed or collapsedinternally3) Excess fouling ofheat exchanger4) Fresh air /exhaust air devicesblocked5) Filter (if fitted)blocked

Remedy1) Increase voltagesetting at VCON77controller2) Replace flexiblesilencer.

3) Service the unit

4) Disconnectducting and removedebris5) Replace filtermedia

5. Air flow failure Fan / fans stopped Switch off the mainselectrical supply tothe unit and a) remove accesspanel and heatexchangerb) check fans forfree operationc) replace if seized

6. Noise at airterminal devices

1) excessive airflow

2) ductingcomponents (QTET)connected directlyover air valve

3) Fan / fans bearingfailure

1) check airflow ratecomplies withcommissioning data2) modify ductingarrangement torelocate QTET aminimum of 2.5diameters from airvalve.3) switch off themains electricalsupply and removeaccess panel andheat exchanger.Check fansindividually forevidence of bearingnoise, replace ifconsideredexcessive.

7. Unit noisy 1) unit not locatedon acoustic mat2) VCON77controller set atincorrect voltage

3) Fan / fans bearingfailure

1) Lift unit and fitacoustic mat2) reduce voltagesetting at VCON77controller, ensuringcompliance withcommissioning data3) repeat as 3 ofprevious remedy

2. Unit will onlyoperate on boost

Transformerdamagedorwiring fault

Switch off the mainselectrical supply tothe unit and;a) check wiring tocontrol switch(NBSW, PCSW orHS6)orb) disconnect wiringto control switch andtest operation ofswitch withMultitester. Replaceswitch if faultyorc) test output ofVCON77 controllerand replace if faulty.

3. Unit trips out Water build up inunit

a) check that unit isinclined to drainconnectionorb) check condensatepipework forblockageorc) check for earthfault on wiring tocontroller / controlswitch / unitord) check for motorthermal fuse trip byswitching off unit,allowing to stand forapprox. 45 minutesthen restarting unit

8.0 Guarantee

22

8.1 Guarantee

This guarantee is offered to you as an extrabenefit and does not effect your legal rights.

The products are guaranteed for one year fromdate of purchase against faulty materials orworkmanship. In the event of any part found tobe defective, providing that:

1. The product has been installed and used inaccordance with the instructions accompanyingeach unit.

2. The product has not been connected to anunsuitable electricity supply.

3. The product has not been subject to misuse,neglect or damage.

4. The product has not been modified or repairby any other person not authorised by thecompany.

5. If claiming under terms guarantee:Please return the complete product, carriagepaid, to the Company, or by post or in person,or in person by your representative.

6. Please ensure that it is adequately packagedand accompanied by a letter clearly marked“guarantee claim”, stating the nature of the faultand providing evidence of date and source ofpurchase.

VENT-AXIA Ltd FLEMING WAY

CRAWLEYWEST SUSSEX

RH10 9YXwww.vent-axia.com

Comp No 370712 - Iss B - 06/04

whole house ventilation system with heat recovery

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